WordPress.com shows my blog twice

I run a site called Ad Rhetorica, but WP.com states that I have two different sites.

One is called adrhetorica.com
The other is http://www.adrhetorica.com

I’m fairly certain that this will serious screw me over with blog stats, PR and the like, so I need to know what the heck is going on, and how can I get only one true blog to show.

Additional: The main site itself goes to the http://www.adrhetorica.com stats, so I’m thinking the other one is an orphan or something.